VSYNC trace event ending prematurely #115161
Description
The VSYNC end event is coming in out of order. Here is an example with (event name - phase - timestamp):
flutter: VSYNC - B - 667560813352
flutter: VsyncCallback - B - 667560813467
flutter: VsyncFireCallback - B - 667560813485
flutter: VsyncFireCallback - E - 667560813504
flutter: VsyncCallback - E - 667560813507
flutter: VsyncProcessCallback - B - 667560813527
flutter: Animator::BeginFrame - B - 667560813530
flutter: BUILD - B - 667560813669
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560821603
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560828633
flutter: VSYNC - E - 667560830019 ************************************** Problem event
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560834417
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560844473
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560853355
flutter: SampleBlockBuffer::ProcessCompletedBlocks - X - 667560865931
flutter: BUILD - E - 667560866947
These are Synchronous events so the VSYNC event should not be finishing until all its children do. Are we missing an await somewhere?